检索结果-南通市图书馆

Stochastic simulation of growth curves of Acidithiobacillus ferrooxidans

Journal of Central South University of Technology 2006年第5期13卷 473-476页

作者：杨宇彭宏邱冠周柳建设胡岳华 School of Minerals Processing and Bioengineering Central South University

To reveal the low growth rate of Acidithiobacillus ferrooxidans, a stochastic growth model was proposed to analyze growth curves of these bacteria in a batch culture. An algorithm was applied to simulate the bacteria population during lag and exponential phase. The results show that the model moderately fits the experimental data. Further, the mean growth constant （K） of growth curves is obtained by fitting the logarithm of the simulating population data versus the generation numbers with the different initial population number （N0） and initial mean activity of population （A0）. When No is 300 and 700 respectively, the discrepancy of K value is only 0.91%, however, A0 is 0.34 and 0.38 respectively, the discrepancy of K value is 19.53%. It suggests that the effect of A0 on the lag phase exceeds No, though both parameters could shorten the lag phase by increasing their values.

关键词： Acidithiobacillus ferrooxidans stochastic simulation growth curves lag phase

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Male external genitalia growth curves and charts for children and adolescents aged 0 to 17 years in Chongqing, China

引用

Asian Journal of Andrology 2018年第6期20卷 567-571页

作者： Yi-Nan Wang Qmg Zeng Feng Xiong Yah Zeng Department of Medical Statistics and Information Management School of Public Health and Management Chongqing Medical University Chongqing 400016 China Department of Endocrinology the Children's Hospital of Chongqing Medical University Chongqing 400014 China

Genital size is a crucial index for the assessment of male sexual development, as abnormal penile or testicular size may be the earliest visible clinical manifestation of some diseases. However, there is a lack of data regarding penile and testicular size measurements for Chinese boys at all stages of childhood and puberty. This cross-sectional study aimed to develop appropriate growth curves and charts for male external genitalia among children and adolescents aged 0-17 years in Chongqing, China. A total of 2974 boys were enrolled in the present study. Penile length was measured using a rigid ruler, penile diameter was measured using a pachymeter, and testicular volume was determined using a Prader orchidometer. Age-specific percentile curves for penile length, penile diameter, and testicular volume were drawn using the generalized additive models for location, scale, and shape. Very similar growth curves were found for both penile length and penile diameter. Both of them gradually rose to 10 years of age and then sharply increased from 11 to 15 years of age. However, testicular volume changed little before the age of 10 years. This study contributes to the literature covering age-specific growth curve and charts about male external genitalia in Chinese children and adolescents. These age-related values are valuable in evaluating the growth and development status of male external genitalia and could be helpful in diagnosing genital disorders.

关键词： adolescents children generalized additive model for location scale and shape growth curves penile size testicular volume

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

growth curves Analysis of Five Meat Rabbit Breeds

引用

Journal of Northeast Agricultural University(English Edition) 2001年第2期8卷 111-114页

作者： LIHua LONGJi－rong AnimalScienceDepartment FoshanUniversityGuangdongProvincePRC528231 AnimalScienceAcademyofSichuanProvince PRC610066

The growth curves of five meat rabbit breeds are fitted in form of Gompertz *** results are shown as follows:the goodness of fit is higher than 99 50%;considering the body weight at one hundred day?the maximum weight(A)?the instantaneous relative growth rate(K)?the turning weight(W )?the turning age (t )?the early average daily gain (KW ) selection,the Checkered Giant(GG) and the New Zealand White (NN) are better than other meat breeds,the slauthter age should be at the age of 90 day.

关键词： meat rabbit growth curves analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modeling the growth of individuals in crowded plant populations

引用

Journal of Plant Ecology 2008年第2期1卷 111-116页

作者： Christian Damgaard Jacob Weiner Department of Terrestrial Ecology National Environmental Research InstituteUniversity of AarhusDK-8600 SilkeborgDenmark Department of Ecology Faculty of Life SciencesUniversity of CopenhagenFrederiksbergDenmark and National Center for Ecological Analysis and SynthesisSanta BarbaraCA 93101-5504USA

Aims We present an improved model for the growth of individuals in plant populations experiencing *** Individuals grow sigmoidally according to the Birch model,which is similar to the more commonly used Richards model,but has the advantage that initial plant growth is always *** individual plant growth models are coupled so that there is a maximum total biomass for the *** effects of size-asymmetric competition are modeled with a parameter that reflects the size advantage that larger individual have over smaller *** fit the model to data on individual growth in crowded populations of Chenopodium *** Findings When individual plant growth curves were not coupled,there was a negative or no correlation between initial growth rate and final size,suggesting that competitive interactions were more important in determining final plant size than were plants’initial growth *** coupled growth equations fit the data better than individual,uncoupled growth models,even though the number of estimated parameters in the coupled competitive growth model was far fewer,indicating the importance of modeling competition and the degree of size-asymmetric growth explicitly.A quantitative understanding of stand development in terms of the growth of individuals,as altered by competition,is within reach.

关键词： Birch model growth curves plant competition Richards model size-asymmetric competition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Establishment, growth kinetics, and Susceptibility to AcMNPV of Heat Tolerant Lepidopteran Cell Lines

引用

Virologica Sinica 2011年第3期26卷 198-205页

作者： Yan-lei WU Lei Jiang Yoshifumi Hashimoto Robert R. Granados Guo-xun Li The Center for Advanced Invertebrate Cell Engineering Collaboration with BTI USA Qingdao AgriculturalUniversity Qingdao 266109 China＇~ Boyce Thompson Institute for Plant Research at Cornell University Ithaca NY 14853 USAJ

Lepidopteran heat-tolerant (ht) cell lines have been obtained with sf-9, sf-21 and several Bombyx cells. They have a distinct karyotype, membrane lipid composition, morphology and growth kinetics from the parental cell lines. In this paper, we report the development of ht cell lines from other insect species and examination of their growth characteristics and virus susceptibility. Adaptation of cell lines sf-9, BTI-TN-5B1-4 (High5) and BTI-TN-MG1 (MG1) to 33℃ and 35℃ was carried out by shifting the culture temperature between 28℃ and higher temperatures by a gradual stepwise increase in temperature. The process of adaption to a higher culture temperature was accomplished over a period of 2 months. The cell lines with the temperature adaption were designated as sf9-ht33, sf9-ht35, High5-ht33, High5-ht35, MG1-ht33, MG1-ht35. These cell lines have been subcultured over 70 passages. Adaption to high temperatures was confirmed by a constant population doubling time with individual cell lines. The population doubling time of heat adapted cell lines were 1-4 h less than these of parental cell lines. Cell shapes did not show obvious change, however, the cell size of sf9-ht cells was enlarged and those of High5 and MG1 ht cells were reduced after heat adaption. When the cell lines were infected with Autographa californica nuclear polyhedrosis virus (AcMNPV) at 28℃, 33℃, 35℃ and 37℃, production of budded virus and occlusion bodies in each cell line was optimum at its own adapted temperature.

关键词： Heat-tolerant cell lines Susceptibility of virus Production of virus growth curves Insect cell lines

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Multilevel Model and SAS Programs

The Multilevel Model and SAS Programs

引用

2011 IEEE International Conference on Computer Science and Automation Engineering(CSAE 2011)

作者： Xiaodong Wang College of Mathematics and Computer Science Quanzhou Normal University Quanzhou 362000 P.R.China Jun Tian~* School of Public Health Fujian Medical University Fuzhou 350004 P.R.China

＜正＞The growth curve analysis is a hotspot in the analysis to understand the characteristics of things change over time. However,the conventional curve fitting method does not apply to the structure data obtained by repeated *** the outline design matrix computation can be used to treat the structure data in the growth curve analysis,the corresponding SAS programs are very long and hard to *** this paper,we present algorithms for multi-level model applied to the analysis of the growth *** usage of the algorithms is demonstrated by practical *** very simple and clear SAS programs for the presented method are also given.

关键词： algorithms growth curves multi-level models structured data

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：